Better Highlights (#1320)

* Support for user-defined sounds and colors

* Make color & sound columns selectable

* Add custom row for subscription highlights

* Add subscriptions to custom highlights and centrally manage highlight colors

* Dynamically update message highlight colors

src/controllers/highlights/HighlightBlacklistModel.hpp

@@ -13,6 +13,12 @@ class HighlightBlacklistModel : public SignalVectorModel<HighlightBlacklistUser>
 {
     explicit HighlightBlacklistModel(QObject *parent);
 
+public:
+    enum Column {
+        Pattern = 0,
+        UseRegex = 1,
+    };
+
 protected:
     // turn a vector item into a model row
     virtual HighlightBlacklistUser getItemFromRow(